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Epic variable star 57 EP

HR 7422

RA 293.5354° · Dec -40.0346° · star

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Score breakdown

· 9 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • Fades out of naked-eye view +16
  • Naked-eye visible +8
  • Toward the galactic centre +8
  • Variable star +5
  • White A-type star +5
  • Subgiant (leaving the main sequence) +5
  • Gently variable +4
  • On the zodiac +3
  • A named variable star +3
Total score 57

21 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Toward the galactic centre · +8
  • On the zodiac · +3
  • White A-type star · +5
  • Subgiant (leaving the main sequence) · +5
  • Gently variable · +4
  • Fades out of naked-eye view · +16
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A5IV-III — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • Where it is in life. It is a subgiant, caught in the act of leaving the main sequence as the hydrogen in its core runs out.
  • It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 5.9 you can see it with your own eyes from a dark site, over in Sagittarius.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
0.325
bv
0.105
constellation
Sgr
dist ly
423.0299
luminosity
64.5654
mag
5.89
name
HR 7422
spect
A5IV-III
var amplitude
0.21
var designation
V4089
var max
5.878
var min
6.088

About HR 7422

HR 7422 is an epic variable star. It lies about 423 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 5.89 and has spectral type A5IV-III.

Its spectrum reads A5IV-III — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HR 7422 in the constellation Sgr. At apparent magnitude 5.89, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 7422 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why HR 7422 is an epic variable star

HR 7422 scores 57 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 9 science badges — Variable star, Naked-eye visible, Toward the galactic centre, On the zodiac, White A-type star, Subgiant (leaving the main sequence), Gently variable and Fades out of naked-eye view — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.